Today marks ten years since Facebook was unleashed onto the world. One of the co-founders, Eduardo Saverin, whose betrayal by Mark Zuckerberg was immortalized in The Social Network, put any hard feelings behind him and wrote Facebook a happy birthday note—on Facebook, of course.

Saverin now lives in Singapore after giving up his U.S. citizenship, largely to keep as much money as he can from the stake he still has in the company, since Singapore has no capital gains tax.